The lagging tax payments were among 93 instances of poor practices and a lack of agency policy cited by the Office of the Auditor of Public Accounts. The audit was posted online Monday.
The department operates the state's 36 parks and oversees land conservation.
The audit was done at the request of the Senate Finance Committee. Auditors met in February with the department's managers, who said they "had significant concerns over internal controls and compliance agency-wide."
The department's new director, Clyde E. Cristman, said he has no complaints with the review. He said corrective action has already begun.